As the number of older people using the Internet continues to grow, their specific accessibility requirements while using digital technology often go unaddressed. This qualitative study aimed to investigate potential obstacles regarding the accessibility of two Swedish public sector websites for older adults when they are visited on a smartphone, and how they relate to the guidelines in WCAG 2.1 and the basic principles of information architecture. The study also aims at exploring the internet and mobile technology usage patterns among the elderly population. Six participants were enlisted to partake in an interview, accompanied by an observation combined with a think-aloud method, enabling them to articulate their emotions and viewpoints regarding the user experience. The study’s objective when using the studied websites on a smartphone, as well as to grain a comprehensive understanding of the participants’ overall user experience. This exploration aimed to enhance the comprehension of website accessibility for older adults within the realm of public sector websites. The findings of the study show a small number of difficulties regarding the accessibility on both websites. Most of the difficulties could be related to the guidelines in WCAG 2.1 and some of them could be related to the basic principles of information architecture. The results also showed that the participants use their smartphones often or every day and that the vast majority visit websites often or daily via their smartphones.